- Calculate ammonium sulphate, NADH, a-ketoglutarate and proteins concentrations in the reaction medium at t = 0. - Draw the graph A = f(t). Calculate A340 at t = 0 and place this point on the curve. - Calculate the initial rate V₂ of the reaction in M.s1.

Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
Section: Chapter Questions
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The glutamate dehydrogenase (GDH) catalyses the following reaction:
H
+H₂N- -C -COO
CH₂
CH₂
COO™
acide glutamique
+ NAD + H₂O
GDH
Time (min)
A340
COO™
c=o
CH₂
5
1
2
3
4
1.760 1.718 1.675 1.635 1.595
CH₂
COO
+ NH4+ NADH + H+
acide a-cétoglutarique
The activity of GDH is monitored in the sense of the formation of glutamate using the
following conditions:
0.2 mL of 5 M ammonium sulphate
2.4 mL of buffer at pH 8
0.1 mL of NADH at 6.15 mg.mL-¹ (M = 709 g.mol-¹)
0.2 mL of 1 M a-ketoglutarate solution
Warm mixture at 25 °C for 5 min
Add 0.1 mL of GDH solution containing 1.6 mg.mL-¹protein to start the
reaction.
The change in absorbance at 340 nm is monitored, in a 1-cm cuvette, every minute
for 10 min. Results are given in the table below:
Data ENADH at 340 nm = 6220 M¹.cm7
6
7
8
9 10
1.550 1.510 1.489 1.476 1.451
Calculate ammonium sulphate, NADH,
concentrations in the reaction medium at t = 0.
proteins
- Draw the graph A = f(t). Calculate A340 at t = 0 and place this point on the curve.
- Calculate the initial rate V₁ of the reaction in M.s¹.
a-ketoglutarate and
Transcribed Image Text:The glutamate dehydrogenase (GDH) catalyses the following reaction: H +H₂N- -C -COO CH₂ CH₂ COO™ acide glutamique + NAD + H₂O GDH Time (min) A340 COO™ c=o CH₂ 5 1 2 3 4 1.760 1.718 1.675 1.635 1.595 CH₂ COO + NH4+ NADH + H+ acide a-cétoglutarique The activity of GDH is monitored in the sense of the formation of glutamate using the following conditions: 0.2 mL of 5 M ammonium sulphate 2.4 mL of buffer at pH 8 0.1 mL of NADH at 6.15 mg.mL-¹ (M = 709 g.mol-¹) 0.2 mL of 1 M a-ketoglutarate solution Warm mixture at 25 °C for 5 min Add 0.1 mL of GDH solution containing 1.6 mg.mL-¹protein to start the reaction. The change in absorbance at 340 nm is monitored, in a 1-cm cuvette, every minute for 10 min. Results are given in the table below: Data ENADH at 340 nm = 6220 M¹.cm7 6 7 8 9 10 1.550 1.510 1.489 1.476 1.451 Calculate ammonium sulphate, NADH, concentrations in the reaction medium at t = 0. proteins - Draw the graph A = f(t). Calculate A340 at t = 0 and place this point on the curve. - Calculate the initial rate V₁ of the reaction in M.s¹. a-ketoglutarate and
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